Constantinos 'Dinos' Martinos is a Greek billionaire, shipowner, and businessman. His wealth is rooted in the immense, multi-generational Martinos family shipping dynasty. Born in Athens, Greece, in 1953, his life was immersed in the world of maritime commerce; his mother, Athina Martinos, was one of the first female shipowners in Greece and founded the shipping company Thenamaris in 1971.

From an early age, he was actively involved in shipping, helping manage the family fleet from the mid-1960s. In 1972, he co-founded Thenamaris Ships Management with his mother and siblings. His career is defined by his commitment to running and scaling this massive, vertically integrated shipping company, which operates a modern fleet of over 95 vessels.

Constantinos Martinos's career is defined by his continuous leadership of Thenamaris Ships Management. The company's strategic vision, built by his mother, focused on maintaining a modern fleet and mastering the complex logistics of global maritime trade in essential commodities (including tankers, bulk carriers, LNG carriers, and container ships).

Over time, his siblings withdrew from the business, leaving Constantinos as the principal manager of Thenamaris, while his brothers, Athanasios and Andreas, established their own successful separate shipping companies. This specialization and mastery of fleet operations have made Thenamaris one of the world's leading shipping companies. His son, Nikolas Martinos, now runs Thenamaris, ensuring the generational continuity of the family's core shipping business, while another son, Ioannis Martinos, founded his own shipping company, the Signal Group.

Constantinos Martinos's social impact is structural, stemming from Thenamaris's role in facilitating global commodity trade and maritime employment. The family has a strong tradition of philanthropic giving, often supporting public health initiatives.

He is known for his substantial contributions to healthcare, including the funding and foundation of a new building with 115 hospital beds at the Asklipieio Hospital of Voula (a project valued at 10 million euros). His personal commitment to art collection and its preservation also provides a major cultural contribution to Greece.

Constantinos Martinos maintains the traditional, highly discreet style of a Greek shipowner. His attire is consistently formal and professional, favoring tailored suits. His aesthetic is one of quiet, established wealth, reflecting the long-term, conservative nature of the shipping industry.

Residing in Glyfada, Athens, his luxury is the security of his multi-billion dollar fortune and the autonomy to pursue his personal passions for art collection and philanthropy. His life is dedicated to the high-stakes management of a massive global fleet and the preservation of his family's industrial and cultural legacy.